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csquotes.sty
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% $Id: csquotes.sty,v 5.1d 2011/10/22 19:17:39 lehman stable $
% Copyright (c) 2003-2011 Philipp Lehman.
%
% Permission is granted to copy, distribute and/or modify this
% software under the terms of the LaTeX Project Public License
% (LPPL), version 1.3.
%
% The LPPL maintenance status of this software is
% 'author-maintained'.
%
% This software is provided 'as is', without warranty of any kind,
% either expressed or implied, including, but not limited to, the
% implied warranties of merchantability and fitness for a
% particular purpose.
\def\csq@rcsid$#1: #2 #3 #4 #5${#4 v#3}
\NeedsTeXFormat{LaTeX2e}[2005/12/01]
\ProvidesPackage{csquotes}
[\csq@rcsid $Id: csquotes.sty,v 5.1d 2011/10/22 19:17:39 lehman stable $
context-sensitive quotations]
\def\csq@version$#1: #2.#3 ${#2#3}
\edef\csq@version{\csq@version$Revision: 5.1 $}
%% Compatibility and requirements
\RequirePackage{etoolbox}
\RequirePackage{keyval}
\@ifpackagelater{etoolbox}{2008/06/28}
{}
{\PackageError{csquotes}
{Outdated 'etoolbox' package}
{Upgrade to etoolbox v1.7 (2008/06/28) or later.\MessageBreak
I found: '\csuse{ver@etoolbox.sty}'.\MessageBreak
This is a fatal error. I'm aborting now.}%
\endinput}
\@ifpackageloaded{inputenc}
{}
{\AtEndPreamble{%
\@ifpackageloaded{inputenc}
{\csq@warn@loadfirst{inputenc}}
{}}}
\@ifpackageloaded{inputenx}
{}
{\AtEndPreamble{%
\@ifpackageloaded{inputenx}
{\csq@warn@loadfirst{inputenx}}
{}}}
\@ifpackageloaded{ucs}
{\let\csq@ifucs\@firstoftwo}
{\let\csq@ifucs\@secondoftwo
\AtEndPreamble{%
\@ifpackageloaded{ucs}
{\let\csq@ifucs\@firstoftwo}
{}}}
\AtEndPreamble{%
\@ifpackageloaded{biblatex}
{\@ifpackagelater{biblatex}{2009/05/30}
{}
{\csq@error
{Outdated 'biblatex' package}
{Upgrade to biblatex v0.8d (2009/05/30) or later.\MessageBreak
I found: '\csuse{ver@biblatex.sty}'}}}
{}}
%% Category codes
\def\csq@catcodes{\do\~\do\&\do\:\do\"\do\<\do\>}
\def\do#1{\catcode\number`#1=\the\catcode`#1\relax}
\edef\csq@catcodes{\csq@catcodes}
\let\do\noexpand
\catcode`\~=\active
\catcode`\&=3
\@makeother\:
\@makeother\"
\@makeother\<
\@makeother\>
%% General
\newtoggle{csq@tempsw}
\newtoggle{csq@quiet}
\newtoggle{csq@active}
\newtoggle{csq@block}
\newtoggle{csq@parbox}
\newtoggle{csq@parthreshold}
\newbool{csdisplay}
\newcount\csq@reset
\newcount\csq@gtype
\newcount\csq@glevel
\newcount\csq@qlevel
\newcount\csq@maxlvl
\newcount\csq@tshold
\providecommand{\@gobblethree}[3]{}
\providecommand{\@gobblefive}[5]{}
\providecommand{\@gobbletwo@optarg}[2][]{}
% {<item>}{<list>}{<separator>}
\def\csq@addto@list#1{%
\expandafter\csq@addto@list@i\csname\string#1\endcsname}
\def\csq@addto@list@i#1#2#3{%
\begingroup
\@tempswatrue
\def#3##1{\ifnum`#1=`##1\relax\@tempswafalse\fi}#2%
\expandafter\endgroup\if@tempswa
\appto#2{#3#1}%
\fi}
% {<macro>}
\def\csq@everypar#1{%
\let\csq@theeverypar#1%
\ifx\csq@theeverypar\@empty
\else
\csq@everypar@i
\fi}
\def\csq@everypar@i{%
\leavevmode
\let\csq@new@everypar\everypar
\csq@ltx@everypar=\expandafter{\the\everypar}%
\csq@new@everypar={\the\csq@ltx@everypar\csq@theeverypar}%
\let\everypar\csq@ltx@everypar
\let\csq@everypar@i\relax}
\newtoks\csq@ltx@everypar
% Miscellaneous tests
\newcommand*{\ifblockquote}{\iftoggle{csq@block}}
\def\csq@ifsafeactives{%
\ifx\if@safe@actives\iftrue
\expandafter\@firstoftwo
\else
\expandafter\@secondoftwo
\fi}
\def\csq@iftypeset{%
\ifx\protect\@typeset@protect
\expandafter\@firstoftwo
\else
\expandafter\@secondoftwo
\fi}
\def\csq@ifstrings{%
\ifx\protect\string
\expandafter\@firstoftwo
\else
\expandafter\@secondoftwo
\fi}
\def\csq@ifnested{%
\iftoggle{csq@block}
{\@firstoftwo}
{\ifnumgreater\csq@qlevel\z@}}
% Parsers for UTF-8
\def\csq@string#1{\csq@string@i#1&}
\def\csq@string@i#1#2&{%
\string#1\ifblank{#2}{}{\csq@string@i#2&}}
\def\csq@number#1{\csq@number@i#1&}
\def\csq@number@i#1#2&{%
\number`#1 \ifblank{#2}{}{.\csq@number@i#2&}}
\def\csq@utfprint#1{u8:\csq@utfprint@i#1&}
\def\csq@utfprint@i#1#2&{%
\number`#1 \ifblank{#2}{}{:\csq@utfprint@i#2&}}
% Grouping control
\protected\def\csq@bqgroup{%
\bgroup\leavevmode
\csq@glevel\currentgrouplevel
\csq@gtype\currentgrouptype}
\protected\def\csq@eqgroup{%
\ifnum\csq@gtype=\currentgrouptype
\ifnum\csq@glevel=\currentgrouplevel
\else
\csq@err@glevel
\fi
\else
\csq@err@gtype
\fi
\egroup}
\AtEndDocument{%
\ifnum\csq@qlevel>\z@
\csq@err@gleft
\fi}
%% User feedback
\protected\def\csq@warning@loose#1{%
\csq@warning{#1}\@gobbletwo}
\protected\def\csq@warning@strict#1{%
\csq@error}
\let\csq@warnorerr\csq@warning@loose
\protected\def\csq@error#1#2{%
\PackageError{csquotes}{#1}{#2.}}
\protected\def\csq@warning#1{%
\PackageWarning{csquotes}{#1}}
\protected\def\csq@info#1{%
\iftoggle{csq@quiet}
{}
{\PackageInfo{csquotes}{#1\csq@noline}}}
\let\csq@noline\@gobble
\AtBeginDocument{\let\csq@noline\@empty}
\protected\def\csq@logdebug#1{%
\begingroup
\def\MessageBreak{^^J(csquotes) \@spaces\@spaces\@spaces\space}%
\set@display@protect
\immediate\write\m@ne{Package csquotes Debug: #1\on@line.}%
\endgroup}
\let\csq@debug\@gobble
% Errors
\protected\def\csq@errormark{%
\rule[0.25ex]{1.25ex}{1.25ex}}
\protected\def\csq@eqerror{%
\csq@eqgroup
\csq@errormark}
\protected\def\csq@mismatch#{%
\csq@errormark
\csq@err@mismatch}
\protected\def\csq@err@mismatch#1{%
\csq@error
{Unbalanced groups or invalid nesting}
{#1}}
\protected\def\csq@err@mmode#1{%
\csq@error
{'\string#1' invalid in math mode}
{This command may not be used in math mode}}
\protected\def\csq@err@undef#1{%
\csq@error
{'\string#1' not defined}
{This command or environment environment appears to
be\MessageBreak undefined}}
\protected\def\csq@err@opt#1{%
\csq@error
{Option '#1' invalid}
{The option you have supplied is invalid. See the csquotes
manual\MessageBreak for valid option keys and values}}
\protected\def\csq@err@sfcodes#1{%
\csq@error
{'\string#1' not available}
{'\string#1' may not be used here because the\MessageBreak
punctuation tracker is not working at this point}}
\protected\def\csq@err@glevel{%
\csq@mismatch{%
I have detected a group level mismatch. Verify that all
groups\MessageBreak and all active quotes are properly
balanced and nested. If you\MessageBreak continue, I
will write a summary of all previously opened
groups\MessageBreak to the transcript file}%
\showgroups}
\protected\def\csq@err@gtype{%
\csq@mismatch{%
I have detected a group type mismatch. Verify that all
groups\MessageBreak and all active quotes are properly
balanced and nested. If you\MessageBreak continue, I
will write a summary of all previously opened
groups\MessageBreak to the transcript file}%
\showgroups}
\protected\def\csq@err@gleft{%
\csq@err@mismatch{%
Still \number\csq@qlevel\space quote\ifnum\csq@qlevel>\@ne s\fi
\space open. If you continue, I will write a summary\MessageBreak
of all previously opened groups to the transcript file}%
\showgroups}
\protected\def\csq@err@alloc{%
\csq@error
{Invalid argument}
{One of the arguments you have supplied is already allocated
as\MessageBreak active quote or delimiter}}
\protected\def\csq@err@char{%
\csq@error
{Invalid argument}
{Only single characters with category code 12 or 13 may
be\MessageBreak allocated as active quotes. Numbers,
punctuation marks, and\MessageBreak characters which
are part of LaTeX's syntax or reserved\MessageBreak
for a specific purpose are invalid}}
\protected\def\csq@err@utf{%
\csq@error
{Invalid argument}
{Only valid UTF-8 sequences representing a single
character\MessageBreak may be allocated as active quotes}}
\protected\def\csq@err@nbquote{%
\csq@mismatch{%
You have nested a \@backslashchar blockquote. Block quotation
commands\MessageBreak may only be used on quotation level 0}}%
\protected\def\csq@err@patch#1{%
\csq@error
{Patching #1 failed}
{This is an internal issue typically caused by a
conflict\MessageBreak between csquotes and some
other package. Modifying\MessageBreak the package
loading order may fix the problem}}
\protected\def\csq@err@ucs{%
\csq@error
{ucs package not supported}
{The ucs package is not supported. If you want to use
UTF-8\MessageBreak encoded active quotes, try
'\string\usepackage[utf8]{inputenc}'.\MessageBreak
If you continue now, I will reject all UTF-8 encoded
arguments\MessageBreak as invalid}}
% Warnings
\protected\def\csq@warn@loadfirst#1{%
\csq@warnorerr
{Load '#1' before 'csquotes'}
{'#1' package loaded too late}
{Always load '#1' before 'csquotes'}}
\protected\def\csq@warn@multilang#1{%
\csq@warnorerr
{No multilingual support.\MessageBreak #1}
{#1}
{Multilingual support does not seem to be available.\MessageBreak
Try loading the 'babel' or the 'polyglossia' package}}
\protected\def\csq@warn@style#1{%
\csq@warnorerr
{No style for language '#1'.\MessageBreak
Using fallback style}
{No style for language '#1'}
{Define a style or alias for this language first}}
\protected\def\csq@warn@location#1{%
\csq@warnorerr
{'\string#1' invalid at this point.\MessageBreak
Ignoring command}
{'\string#1' invalid at this point}
{This command may not be used at this particular
point.\MessageBreak See the manual of the 'csquotes'
package for details}}
\protected\def\csq@warn@sfcodes#1{%
\csq@warnorerr
{No space factor codes for '#1' encoding.\MessageBreak
Punctuation tracker may fail}
{Punctuation tracker may fail at this point}
{No space factor codes for '#1' encoding.
See \string\DeclareQuoteGlyph\MessageBreak
in the 'csquotes' manual for details}}
%% Outer quotations
\protected\def\csq@oqmark{%
\csq@bqgroup
\ifnum\csq@qlevel>\z@
\csq@mismatch{%
Level 1 quote invalid at this point.
The current level is \number\csq@qlevel}%
\advance\csq@qlevel\@ne
\let\csq@oqmark\csq@eqerror
\else
\csq@qlevel\@ne
\let\csq@oqmark\csq@qclose
\expandafter\csq@qopen
\fi}
%% Inner quotations
\protected\def\csq@iqmark{%
\csq@bqgroup
\ifnum\csq@qlevel>\@ne
\csq@mismatch{%
Level 2 quote invalid at this point.
The current level is \number\csq@qlevel}%
\advance\csq@qlevel\@ne
\let\csq@iqmark\csq@eqerror
\else
\csq@qlevel\tw@
\let\csq@iqmark\csq@qclose
\expandafter\csq@qopen
\fi}
%% Nestable quotations
\protected\def\csq@oqopen{%
\csq@bqgroup
\csq@oqopen@i}
\def\csq@oqopen@i{%
\advance\csq@qlevel\@ne
\csq@qopen}
\protected\def\csq@iqopen{%
\csq@bqgroup
\csq@iqopen@i}
\def\csq@iqopen@i{%
\ifnum\csq@qlevel=\z@
\advance\csq@qlevel\tw@
\else
\advance\csq@qlevel\@ne
\fi
\csq@qopen}
%% Opening marks
\def\csq@qopen{%
\ifnum\csq@qlevel>\csq@maxlvl
\csq@mismatch{%
Level \number\csq@qlevel\space quote invalid at this point.
The maximum level is \number\csq@maxlvl}%
\else
\csq@resetstyle
\csq@init
\csq@addkern@open
\ifodd\csq@qlevel
\let\csq@kernchar@i\csq@thequote@oopen
\csq@thequote@oopen
\else
\let\csq@kernchar@i\csq@thequote@iopen
\csq@thequote@iopen
\fi
\csq@setmarker@open
\expandafter\csq@fixkern
\fi}
%% Closing marks
\protected\def\csq@qclose{%
\csq@qclose@i{}}
\def\csq@qclose@i{%
\ifnum\csq@qlevel=\z@
\csq@mismatch{%
Cannot close any quote. The current level is 0}%
\else
\ifnum\csq@qlevel>\csq@maxlvl
\csq@eqerror
\else
\expandafter\expandafter
\expandafter\csq@qclose@ii
\fi
\fi}
\def\csq@qclose@ii#1{%
\ifdim\lastkern=\csq@omitmarker
#1\csq@eqgroup
\else
\csq@addkern@close
\ifodd\csq@qlevel
\csq@thequote@oclose
\let\csq@kernchar@i\csq@thequote@oclose
\else
\csq@thequote@iclose
\let\csq@kernchar@i\csq@thequote@iclose
\fi
\ifnum\csq@qlevel>\@ne
\csq@setmarker@close
\fi
\ifblank{#1}{}{\expandafter#1}%
\expandafter\csq@eqgroup
\expandafter\def
\expandafter\csq@kernchar@i
\expandafter{\csq@kernchar@i}%
\expandafter\csq@fixkern
\fi}
%% Style initialization
\def\csq@init{%
\csq@setsfcodes
\ifodd\csq@qlevel
\csq@thequote@oinit
\csq@everypar\csq@thequote@omiddle
\else
\csq@thequote@iinit
\csq@everypar\csq@thequote@imiddle
\fi
\csq@init@kern{open}{o}{i}%
\csq@init@kern{close}{i}{o}}
\def\csq@init@kern#1#2#3{%
\begingroup
\settowidth{\@tempdima}{%
\csuse{csq@thequote@#2#1}%
\csuse{csq@thequote@#3#1}}%
\settowidth{\@tempdimb}{%
\csuse{csq@thequote@#2#1}\unkern
\csuse{csq@thequote@#3#1}}%
\ifdim\@tempdima=\@tempdimb
\let\csq@tempa\endgroup
\else
\edef\csq@tempa{\endgroup
\csdef{csq@thekern@#1}{%
\the\dimexpr\@tempdima-\@tempdimb\relax}}%
\fi
\csq@tempa}
\def\blx@hook@parboxrestore{%
\let\csq@theeverypar\@empty
\csq@qlevel\z@
\toggletrue{csq@parbox}%
\togglefalse{csq@block}}
\protected\def\blx@parboxrestore{%
\ifx\protect\noexpand % \@outputpage
\else
\blx@hook@parboxrestore
\fi}
\appto\@parboxrestore{\blx@parboxrestore}
%% Restore kerning
\def\csq@fixkern{%
\expandafter\expandafter\expandafter
\expandafter\expandafter\expandafter
\expandafter\csq@fixkern@i}
\def\csq@fixkern@i{%
\futurelet\csq@kernchar@ii\csq@fixkern@ii}
\def\csq@fixkern@ii{%
\ifcat a\noexpand\csq@kernchar@ii
\expandafter\csq@fixkern@iii
\else
\ifcat 1\noexpand\csq@kernchar@ii
\expandafter\expandafter
\expandafter\csq@fixkern@iii
\fi
\fi}
\def\csq@fixkern@iii{%
\begingroup
\settowidth{\@tempdima}{%
\csq@kernchar@i\csq@kernchar@ii}%
\settowidth{\@tempdimb}{%
\csq@kernchar@i\kern\z@\csq@kernchar@ii}%
\ifdim\@tempdima=\@tempdimb
\else
\addtolength{\@tempdima}{-\@tempdimb}%
\penalty\@M\hskip\@tempdima\relax
\fi
\endgroup}
%% Detect and kern adjoining quotes
\def\csq@kernmarker{13sp}
\def\csq@omitmarker{17sp}
\let\csq@themarker\csq@kernmarker
\def\csq@thekern@open{\csq@thequote@kern}
\def\csq@thekern@close{\csq@thequote@kern}
\def\csq@thequote@kern{0.1em}
\def\csq@setmarker@open{%
\penalty\@M
\hskip-\csq@themarker\relax
\hskip\csq@themarker\relax}
\def\csq@setmarker@close{%
\kern-\csq@themarker\relax
\kern\csq@themarker\relax}
\def\csq@addkern@open{%
\ifdim\lastskip=\csq@kernmarker
\unskip\unskip\unpenalty
\unkern % EC fix
\ifdim\csq@thekern@open=\z@
\else
\penalty\@M\hskip\csq@thekern@open\relax
\fi
\fi}
\def\csq@addkern@close{%
\ifdim\lastkern=\csq@kernmarker
\unkern\unkern
\ifdim\csq@thekern@close=\z@
\else
\penalty\@M\hskip\csq@thekern@close\relax
\fi
\fi}
%% Punctuation
% 1001 apostrophe (biblatex only)
% 1002 abbreviation dot (biblatex only)
% 1003/1250 comma
% 1004/1500 semicolon
% 1005/2000 colon
% 1006/3000 period
% 1007/3001 exclamation mark
% 1008/3002 question mark
% 1009 suppress punctuation (biblatex only)
\mathchardef\csq@sf@comma=1003
\mathchardef\csq@sf@semicolon=1004
\mathchardef\csq@sf@colon=1005
\mathchardef\csq@sf@period=1006
\mathchardef\csq@sf@exclam=1007
\mathchardef\csq@sf@question=1008
\mathchardef\csq@sf@threshold@low=1002
\mathchardef\csq@sf@threshold@term=1005
\mathchardef\csq@sf@threshold@high=1009
\def\csq@setsfcodes{%
\ifcsdef{csq@sfcodes@\f@encoding}
{\csuse{csq@sfcodes@\f@encoding}}
{\csq@warn@sfcodes\f@encoding}%
\sfcode`\)=\z@
\sfcode`\]=\z@
\ifnum\sfcode`\.>2000
\csq@setencodes
\else
\csq@setfrcodes
\fi
\let\frenchspacing\csq@setfrcodes
\let\nonfrenchspacing\csq@setencodes
\let\csq@setsfcodes\relax}
\def\csq@ifsfcodes{%
\ifnumequal\csq@sf@question
{\ifcsdef{csq@sfactor@\the\sfcode`\?}
{\csuse{csq@sfactor@\the\sfcode`\?}}
{\sfcode`\?}}}
\def\csq@setfrcodes{%
\ifnum\sfcode`\A=\@m
\else
\csq@setazcodes
\fi
\sfcode`\,=1003
\sfcode`\;=1004
\sfcode`\:=1005
\sfcode`\.=1006
\sfcode`\!=1007
\sfcode`\?=1008
}
\def\csq@setencodes{%
\sfcode`\,=1250
\sfcode`\;=1500
\sfcode`\:=2000
\sfcode`\.=3000
\sfcode`\!=3001
\sfcode`\?=3002
}
\begingroup
\let\csq@setazcodes\@empty
\def\csq@tempa{%
\xdef\csq@setazcodes{\csq@setazcodes\sfcode\the\@tempcnta=\@m}
\ifnum\@tempcnta<\@tempcntb
\advance\@tempcnta\@ne
\expandafter\csq@tempa
\fi}
\@tempcnta`\A
\@tempcntb`\Z
\csq@tempa
\ifnum\inputlineno=\m@ne\else
\@tempcnta"80
\@tempcntb"9C
\csq@tempa
\@tempcnta"C0
\@tempcntb"DF
\csq@tempa
\fi
\endgroup
\csdef{csq@sfactor@1250}{1003}
\csdef{csq@sfactor@1500}{1004}
\csdef{csq@sfactor@2000}{1005}
\csdef{csq@sfactor@3000}{1006}
\csdef{csq@sfactor@3001}{1007}
\csdef{csq@sfactor@3002}{1008}
\def\csq@spacefactor{%
\ifhmode
\ifcsdef{csq@sfactor@\the\spacefactor}
{\csuse{csq@sfactor@\the\spacefactor}}
{\the\spacefactor}%
\else
1000%
\fi}
% {<true>}{<false>}
\newcommand*{\ifpunct}{%
\csq@ifsfcodes
{\ifnumgreater\csq@spacefactor\csq@sf@threshold@low
{\ifnumless\csq@spacefactor\csq@sf@threshold@high}
{\@secondoftwo}}
{\csq@err@sfcodes\ifpunct
\@secondoftwo}}
% {<text>}{<true>}{<false>}
\newrobustcmd*{\iftextpunct}[1]{%
\csq@ifpuncttest{#1}{\ifpunct}}
% {<true>}{<false>}
\newcommand*{\ifterm}{%
\csq@ifsfcodes
{\ifnumgreater\csq@spacefactor\csq@sf@threshold@term
{\ifnumless\csq@spacefactor\csq@sf@threshold@high}
{\@secondoftwo}}
{\csq@err@sfcodes\ifterm
\@secondoftwo}}
% {<text>}{<true>}{<false>}
\newrobustcmd*{\iftextterm}[1]{%
\csq@ifpuncttest{#1}{\ifterm}}
% {<character>}{<true>}{<false>}
\newrobustcmd*{\ifpunctmark}[1]{%
\csq@ifsfcodes
{\ifbool{hmode}
{\ifnumequal{\sfcode`#1}\spacefactor}
{\@secondoftwo}}
{\csq@err@sfcodes\ifpunctmark
\@secondoftwo}}
% {<text>}{<character>}{<true>}{<false>}
\newrobustcmd*{\iftextpunctmark}[2]{%
\csq@ifpuncttest{#1}{\ifpunctmark{#2}}}
\def\csq@ifpuncttest#1#2{%
\begingroup
\setbox\@tempboxa=\hbox{%
\csq@ifsfcodes\relax\csq@setsfcodes
#1#2
{\aftergroup\@firstoftwo}
{\aftergroup\@secondoftwo}}%
{\endgroup\@firstoftwo}
{\endgroup\@secondoftwo}}
%% Multilingual interface
\def\csq@setstyle#1{%
\begingroup
\let\if@safe@actives\iftrue
\ifcsdef{csq@qstyle@#1}
{\edef\csq@tempa{\endgroup
\def\noexpand\csq@currentstyle{#1}%
\noexpand\csuse{csq@qstyle@#1}}%
\csq@tempa}
{\csq@warnorerr
{Quote style '#1' not defined.\MessageBreak Ignoring command}
{Quote style '#1' not defined}
{Define the style or alias first}
\endgroup}}
\def\csq@resetstyle{%
\ifnum\csq@reset=\@ne
\ifx\csq@currentstyle\languagename
\else
\ifcsundef{csq@qstyle@\languagename}
{\csq@warn@style\languagename
\csq@setstyle{fallback}}
{\csq@setstyle{\languagename}}%
\fi
\fi}
\def\csq@savelang{%
\ifdef\csq@mainlang
{}
{\edef\csq@mainlang{\languagename}}}
\def\csq@resetlang{%
\ifdef\csq@mainlang
{\csuse{otherlanguage*}{\csq@mainlang}%
\let\csq@resetlang\relax}
{}}
\protected\long\def\csq@switchlang#1{%
\ifdef\csq@mainlang
{\begingroup
\csuse{otherlanguage*}{\csq@mainlang}%
#1%
\csuse{endotherlanguage*}%
\endgroup}
{#1}}
% \lowercase: workaround for page headers of book.cls et al.
\def\csq@lang#1{%
\csq@savelang
\lowercase{\csuse{otherlanguage*}{#1}}}
\def\csq@endlang{%
\csuse{endotherlanguage*}}
\def\csq@nolang#1{%
\begingroup
\lowercase{\def\csq@tempa{#1}}%
\csq@warn@multilang{Cannot switch to language '\csq@tempa'}%
\endgroup}
\def\csq@hyph#1{%
\csq@savelang
\lowercase{\csq@hyphenrules{#1}}}
\let\csq@endhyph\@empty
\def\csq@nohyph#1{%
\begingroup
\lowercase{\def\csq@tempa{#1}}%
\csq@warn@multilang{No hyphenation rules for '\csq@tempa'}%
\endgroup}
\def\csq@hyphenrules#1{%
\language\csname l@#1\endcsname\relax
\ifcsundef{#1hyphenmins}
{\csq@sethyphenmins\tw@\thr@@}
{\expandafter\expandafter\expandafter\csq@sethyphenmins
\csname#1hyphenmins\endcsname}}
\def\csq@sethyphenmins#1#2{%
\lefthyphenmin#1\relax
\righthyphenmin#2\relax}
\appto\csq@hook@multilang{%
\appto\blx@hook@parboxrestore{\csq@resetlang}%
\ifundef\l@usenglish
{\ifundef\l@USenglish
{}
{\let\l@usenglish\l@USenglish}}
{}%
\ifundef\l@ukenglish
{\ifundef\l@UKenglish
{}
{\let\l@ukenglish\l@UKenglish}}
{}%
\ifcase\csq@reset
\or
\or
\csq@info{Enabling multilingual quotes}%
\csq@reset\@ne
\else
\csq@info{Adjusting default style}%
\ifcsdef{csq@qstyle@\csq@main@language}
{\DeclareQuoteAlias{\csq@main@language}{default}}
{\csq@warn@style\csq@main@language
\DeclareQuoteAlias{fallback}{default}}%
\fi}
\appto\csq@hook@nomultilang{%
\ifcase\csq@reset
\or
\csq@warn@multilang{Cannot enable multilingual quotes}%
\or
\or
\csq@warn@multilang{Cannot adjust default style}%
\fi
\csq@reset\z@
\let\csq@hyph\csq@nohyph
\let\csq@endhyph\@empty
\let\csq@lang\csq@nolang
\let\csq@endlang\@empty
\let\csq@switchlang\@firstofone
\def\csq@resetqstyle{%
\csq@warn@multilang{Cannot enable multilingual quotes}}}
%% Markup with control sequences
% Argument parsers
% {<macro>}[<cite>][<punct>] =>
% <macro>{\mkcitation}{<cite>}{<punct>}
\def\csq@getcargs#1{%
\@ifnextchar[%]
{\csq@getcargs@i{#1}}
{\csq@getcargs@i{#1}[]}}
\long\def\csq@getcargs@i#1[#2]{%
\@ifnextchar[%]
{\csq@getcargs@ii{#1}{#2}}
{\csq@getcargs@ii{#1}{#2}[]}}
\long\def\csq@getcargs@ii#1#2[#3]{%
#1{\mkcitation}{#2}{#3}}
% {<macro>}[<pre>][<post>]{<key>}[<punct>] =>
% <macro>{\mkccitation}{\csq@cite[<pre>][<post>]{<key>}}{<punct>}
\def\csq@getccargs#1{%
\@ifnextchar[%]
{\csq@getccargs@i{#1}{}}
{\csq@getccargs@ii{#1}{}}}
\long\def\csq@getccargs@i#1#2[#3]{%
\@ifnextchar[%]
{\csq@getccargs@i{#1}{#2[{#3}]}}
{\csq@getccargs@ii{#1}{#2[{#3}]}}}
\long\def\csq@getccargs@ii#1#2#3{%
\@ifnextchar[%]
{\csq@getccargs@iii{#1}{#2}{#3}}
{\csq@getccargs@iii{#1}{#2}{#3}[]}}
\long\def\csq@getccargs@iii#1#2#3[#4]{%
#1{\mkccitation}{\csq@cite#2{#3}}{#4}}
% {<macro>}<punct> => <macro>{<apunct>}<tpunct>
\protected\long\def\csq@getpunct#1{%
\begingroup
\def\csq@tempa{\endgroup#1}%
\futurelet\@let@token\csq@getpunct@i}
\def\csq@getpunct@i{%
\expandafter\csq@getpunct@ii\csq@allpunct&}
\def\csq@getpunct@ii#1{%
\ifx#1&%
\expandafter\csq@getpunct@v
\fi
\ifx#1\@let@token
\expandafter\csq@getpunct@iii
\fi
\csq@getpunct@ii}
\def\csq@getpunct@iii#1\csq@getpunct@ii#2&{%
\expandafter\csq@getpunct@iv\csq@autopunct&}
\def\csq@getpunct@iv#1{%
\ifx#1&%
\expandafter\csq@getpunct@vi
\fi
\ifx#1\@let@token
\expandafter\csq@getpunct@vii
\fi
\csq@getpunct@iv}
\def\csq@getpunct@v#1\csq@getpunct@ii{\csq@tempa{}\@empty}
\def\csq@getpunct@vi#1\csq@getpunct@iv{\csq@tempa{}}
\def\csq@getpunct@vii#1\csq@getpunct@iv#2{\csq@tempa{#3}\@empty}
% Punctuation
\newrobustcmd*{\DeclareAutoPunct}[1]{%
\ifblank{#1}
{\def\csq@autopunct{}}
{\def\csq@autopunct{#1}}}
\let\csq@autopunct\@empty
\def\csq@allpunct{.,;:!?}
\AfterEndPreamble{% babel
\begingroup
\makeatletter
\endlinechar\m@ne
\edef\csq@tempa{%
\noexpand\scantokens{%
\gdef\noexpand\csq@autopunct{\csq@autopunct}%
\gdef\noexpand\csq@allpunct{\csq@allpunct}}}%
\csq@tempa
\endgroup}
% Plain quotes
\newrobustcmd*{\enquote}{%
\@ifstar{\csq@quote@ii{}{}}{\csq@quote@i{}{}}}